I want to describe all my steps to make my WT1520 a perfect brick. As yo can read down I think my WT1520 was bricked due a bad flash trying to return from Padavan WT1520_220.127.116.11-097.trx firmware to original Nexx firmware NEXX_WT1520H_V1.15_2014011618_upgrade.bin . I have read how to solder wires in RX,TX and GND pads in WT1520 board, so I did it. Then uses a usbtoserial converter to connect it to a terminal program, and as many others have described here, I obtained a response at the serial console. This was the common 9 options countdown response that ever run as default the option 3: Boot system code via Flash (default). I tried 1 and 2 options with no luck. It ever ends with a TTTTTT waiting for the file. The 4 option gives poor options due to the fact that only gives a manual access to the pre-build options 1 to 9. The only option that seems to work was 7. So I decide to change bootloader for a more friendly one, with web based support, the breed-mt7620-reset11.bin file was the selected. I proceed to charge using serial, the charge was perfect and ends with Done. But was a complete disaster, the led light becomes ON full time, and the serial output gone away, no more terminal access was available. I was tried to do many reset tweaks, with time pushing reset and power/reset combinations, but no luck. Now my only option may be to use GPIO solder points an uses it as a JTAG way to recover the item. I have done years ago with my DSL504T router, so I have a Xilinx Jtag paralell port device, but I need to know the GPIO exact equivalence to the leads of my Xilinx Jtag. Then with the proper mtd0 file and the flasher utility, sure I can back to life the wt1520.
aestradarespeto wrote: loderunner84 wrote:
fix it. by usb-uart connect and make firstboot. thanks for this thread!
Hi, I have bricked my WT1520F due to try to return to original firmware. The flash process was fine, but after rebot all was wrong. No light in led, no ip selectable for web menu, no ip present in arp request. Please, I am concerning about soldering wires in TX, RX and GND pads of mainboard. I have a USB to Serial device to connect to the wires (I think RX-TX, and TX-RX, also GND-GND). But I don not know the recovery procedure. What file I must use to recover the boot loader and how to proceed. I have a terminal program called SSCOM3.2 that allows me to transfer files using a serial connection. Any help is wellcome.
(Last edited by aestradarespeto on 5 Jan 2017, 19:01)